Petty officer Matthew 'Nutty' Curran (1882 – 1938) was an Irish professional heavyweight boxer, from 1900 to 1930. His fighting name, "Nutty", was derived from the English slang term for someone who is mentally unbalanced. Curran won the Irish heavyweight title, British Empire heavyweight title, and vied for the British Boxing Board of Control British heavyweight title. British heavyweight title bouts featuring Curran were neither recognized by the National Sporting Club (NSC) at the time, nor retroactively by the British Boxing Board of Control, because the bouts did not take place on National Sporting Club premises. His professional fighting weight varied throughout his career from 178 lb. (81 kg) to 199 lb. (90.3 kg).